Performance of a PFA Cyclonic Spray Chamber with the Thermo ElementXR ICP-MS

Importance of the Topic

The measurement of trace element to calcium ratios in foraminiferal calcite provides crucial insights into past ocean chemistry and climate change. High purity and inert sample introduction are required to achieve accurate low‐level determinations, especially for elements prone to surface adsorption such as boron.

Objectives and Study Overview

This study evaluates the performance of a Savillex PFA cyclonic spray chamber coupled to a Thermo ElementXR high‐resolution ICP‐MS. The primary goal is to assess signal stability, reproducibility, and washout efficiency for multiple trace elements in a mixed HNO3/HF matrix over extended analytical runs.

Methodology and Instrumentation

Samples and calibration standards were prepared in 0.1 M HNO3/0.3 M HF to minimize carryover. An acid blank and three matrix‐matched standards reflecting foraminiferal calcite composition were analyzed. Each standard and blank was measured in sequence, then acid blank, lowest standard, and highest standard were repeated seventeen times to assess drift, reproducibility, and washout.

Used Instrumentation

• Thermo ElementXR HR‐ICP‐MS with demountable torch and 1.8 mm ID platinum injector
• Savillex PFA cyclonic spray chamber with integrated baffle and PFA elbow connection
• Savillex C100 PFA concentric nebulizer

Principal Results and Discussion

The PFA cyclonic chamber delivered short‐term RSD values of 0.5–1 % for high concentration standards. Over a four-hour sequence of 17 replicates, long‐term RSDs ranged from 1.5 to 2.9 % for Li, B, Mg, Al, Ca, Sr, Cd, and Ba. Boron washout to blank levels was achieved within 60 seconds. Low-level boron (2 ppt) was clearly distinguished from blanks, demonstrating high sensitivity and minimal memory effects.

Benefits and Practical Applications

The evaluated sample introduction system offers high sensitivity, excellent stability, rapid washout, and reproducibility over extended runs. These attributes make it well suited for geochemical paleoceanographic studies, environmental monitoring, and any application requiring trace level analysis in aggressive acid matrices.

Future Trends and Potential Applications

Ongoing developments may include further optimization of inert fluoropolymer components, integration with automated sample handling, and expansion to other challenging matrices such as silicate digests. Broader adoption could enhance throughput in environmental, geological, and industrial quality control laboratories.

Conclusion

The Savillex PFA cyclonic spray chamber in combination with the Thermo ElementXR ICP-MS provides a robust, high-performance solution for trace element/calcium ratio determinations in aggressive acid matrices. Its rapid washout and stable signals improve analytical efficiency and data quality.

References

• Misra S, Greaves M, Owen R, Kerr J, Elmore AC, Elderfield H (2014) Determination of B/Ca of natural carbonates by HR‐ICP‐MS. Geochem Geophys Geosyst 15:1617–1628. doi 10.1002/2013GC005049